ASM = nasm
CC = gcc
LD = ld
#x86 vars
C_SRC_PATH_32 = x86/src/c
ASM_SRC_PATH_32 = x86/src/asm
C_FLAGS_32 = -m32 -std=c11 -c -fno-stack-protector -fno-builtin -mno-red-zone -mno-mmx -mno-sse -mno-sse2 -masm=intel -Wall -Wextra
ASM_FLAGS_32 = -f elf32 -I $(ASM_SRC_PATH_32)/
LD_FLAGS_32 = -melf_i386
LD_SCRIPT_32 = build/link32.ld
#x64 vars
C_SRC_PATH_64 = x64/src/c
ASM_SRC_PATH_64 = x64/src/asm
C_FLAGS_64 = -m64 -std=c11 -c -fno-stack-protector -fno-builtin -mno-red-zone -mno-mmx -mno-sse -mno-sse2 -masm=intel -Wall -Wextra
ASM_FLAGS_64 = -f elf64 -I $(ASM_SRC_PATH_64)/
LD_FLAGS_64 = -melf_x86_64
LD_SCRIPT_64 = build/link64.ld

GRUB_CFG = build/grub.cfg
OUTPUT_DIR = temp

#C source code
C_FILES_32 = $(wildcard $(C_SRC_PATH_32)/*.c)
C_FILES_64 = $(wildcard $(C_SRC_PATH_64)/*.c)

#ASM source code
ASM_FILES_32 = $(wildcard $(ASM_SRC_PATH_32)/*.asm)
ASM_FILES_64 = $(wildcard $(ASM_SRC_PATH_64)/*.asm)
#bin files
KERNEL_BIN_32 = $(OUTPUT_DIR)/kernel32.bin
KERNEL_BIN_64 = $(OUTPUT_DIR)/kernel64.bin
#modules

#Object files
C_OBJ_FILES_32 = $(addprefix $(OUTPUT_DIR)/,$(notdir $(C_FILES_32:.c=_x86.o)))
C_OBJ_FILES_64 = $(addprefix $(OUTPUT_DIR)/,$(notdir $(C_FILES_64:.c=_x64.o)))
ASM_OBJ_FILES_32 = $(addprefix $(OUTPUT_DIR)/,$(notdir $(ASM_FILES_32:.asm=_asm_x86.o)))
ASM_OBJ_FILES_64 = $(addprefix $(OUTPUT_DIR)/,$(notdir $(ASM_FILES_64:.asm=_asm_x64.o)))
ALL_OBJ_FILES_32 = $(C_OBJ_FILES_32) $(ASM_OBJ_FILES_32)
ALL_OBJ_FILES_64 = $(C_OBJ_FILES_64) $(ASM_OBJ_FILES_64)

all : init compile link buildiso clean

init:
	sudo mkdir $(OUTPUT_DIR)

compile: $(C_OBJ_FILES_32) $(ASM_OBJ_FILES_32) $(C_OBJ_FILES_64) $(ASM_OBJ_FILES_64)

link: $(KERNEL_BIN_32) $(KERNEL_BIN_64)

clean:
	sudo rm -rf $(OUTPUT_DIR)
buildiso:
	sudo mkdir $(OUTPUT_DIR)/temp_iso
	sudo mkdir $(OUTPUT_DIR)/temp_iso/HOS
	sudo mkdir $(OUTPUT_DIR)/temp_iso/boot
	sudo mkdir $(OUTPUT_DIR)/temp_iso/boot/grub
	sudo mv $(KERNEL_BIN_64) $(OUTPUT_DIR)/temp_iso/HOS/kernel64
	sudo mv $(KERNEL_BIN_32) $(OUTPUT_DIR)/temp_iso/HOS/kernel32
	sudo cp $(GRUB_CFG) $(OUTPUT_DIR)/temp_iso/boot/grub/
	sudo grub-mkrescue -o HOS.iso $(OUTPUT_DIR)/temp_iso

$(OUTPUT_DIR)/%_x86.o: $(C_SRC_PATH_32)/%.c
	sudo $(CC) $(C_FLAGS_32) -o $@ $^

$(OUTPUT_DIR)/%_x64.o: $(C_SRC_PATH_64)/%.c
	sudo $(CC) $(C_FLAGS_64) -o $@ $^

$(OUTPUT_DIR)/%_asm_x86.o: $(ASM_SRC_PATH_32)/%.asm
	sudo $(ASM) $(ASM_FLAGS_32) -o $@ $^

$(OUTPUT_DIR)/%_asm_x64.o: $(ASM_SRC_PATH_64)/%.asm
	sudo $(ASM) $(ASM_FLAGS_64) -o $@ $^

$(KERNEL_BIN_32): $(ALL_OBJ_FILES_32)
	sudo $(LD) $(LD_FLAGS_32) -T $(LD_SCRIPT_32) -o $(KERNEL_BIN_32) $(ALL_OBJ_FILES_32)

$(KERNEL_BIN_64): $(ALL_OBJ_FILES_64)
	sudo $(LD) $(LD_FLAGS_64) -T $(LD_SCRIPT_64) -o $(KERNEL_BIN_64) $(ALL_OBJ_FILES_64)